This transmutation makes a weapon strike true against foes. The weapon is treated as having a +1 enhancement bonus for the purpose of bypassing the DR of creatures or striking incorporeal creatures (though the spell doesn't grant an actual enhancement bonus). Blessed projectile weapons provide these benefits to ammunition fired.

In addition you automatically confirm critical hits against enemies whose alignments are opposed to your own. You must still roll to confirm the critical hit to determine if the special effect of a vorpal weapon activates.